587、most secondary structures are important to the performance of the airplane

901、If a supply shutoff valve was closed for less than five minutes ho maintenance is required and shutoffperiods are hot accumulative. 如果供应关闭阀关闭时间少于 5 分钟，则需要进行维护，关闭时间为热累积。

900、if a company publication style manual is used, the format and layout should follow this Specification tothe extent practicable

899、Identify the wires with sleeves of different colors

898, identify（识别）sections that can cause specific types of trouble. 识别可能导致特定类型的问题的部分。

897、 However, the systems are independent（独立）and there is no fluid exchange between them. 然而，这些系统是独立的，它们之间没有流体交换。

896、 Hold the cylinder tightly.

895、Head aircraft into the wind. 让飞机迎风前进。

894 、 Handbooks shall be readily revisable. They may be in loose-leaf from, with durable, multi-ring cover, or permanently bound.

893、Get medical aid immediately. 马上去就医

892、Get a sample of fuel and do a test for water contamination